W3TC Not Purging Single Posts

I made a change to a post, then went to Facebook so that it could scrape the new information (title change). Facebook kept showing the same title. Sure enough, after choosing to purge a single page post, it was not performing the directive. The post title remained the same on my site, as well as to Facebook. It wasn’t until I selected to empty ALL of my cache did the change reflect on the frontend, and then Facebook was able to notice the change as well.

Which leads to this question, what is wrong with the Purge from Cache command for a single post/page? It doesn’t appear to work. Or is there a setting I am missing?

Thanks.